Allow deleting attachments with an error

app/src/main/java/eu/faircode/email/AdapterAttachment.java

@@ -113,7 +113,8 @@ public class AdapterAttachment extends RecyclerView.Adapter<AdapterAttachment.Vi
         private void bindTo(EntityAttachment attachment) {
             view.setAlpha(attachment.isInline() && attachment.isImage() ? Helper.LOW_LIGHT : 1.0f);
 
-            ibDelete.setVisibility(readonly ? View.GONE : attachment.isInline() ? View.INVISIBLE : View.VISIBLE);
+            ibDelete.setVisibility(readonly ? View.GONE :
+                    attachment.isInline() && attachment.error == null ? View.INVISIBLE : View.VISIBLE);
             ivType.setImageDrawable(null);
             tvName.setText(attachment.name);